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Well, I have been in the trade for a few years, but I am sometimes still a little green on a few things. The reason for joining this forum is so I can have a good chain of experienced techs that I can ask questions when I am unsure.

In the past i've made a timer box to delay the start of two condensing units that were independantly controlled, each had to have a six minute delay on start and each could not start within six minutes of the other, it was on a dairy farm out in the sticks and their power supply wasn't really big enough.
I ended up using four din rail programmable timers and a couple of relays, and a toggle switch for when i was servicing and didn't want to wait twelve minutes

Not sure what your original timer did and how it was interfaced into the system but i'm sure if a guy made it in the first place another guy can make something that does the same job.